Micrometer-gage



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MICROMETER GAGE. APPLlcATloN FILED Aue.13, m9.

1,350, 185. Patented Aug. 17, 1920.

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A framers UNITED STAT THOMAS SHAW, or woQNsocKE'r, RHODE ISLAND;y

, MIGROMETEBfGAGE.

.Specification of Letters Patent.

Application mea August 13, i919. serial' No. 317,217. Y

To all whom it may concern." c Be it known that I, TilroMAs SI-IAW, a citizen of the United States, residing at Voonsocket, in the county oi' Providence and State oi? v Rhode Island, have invented new and useful Improvements in Micrometer-Gages,

of which the following is a Specification.

This invention relates to measuring instruments, particularlyto micrometer gages,yand has for its object the provislonof a micrometer gage embodyingin its construction indi eating wheels movedby rotary movement of the handle and carryingv indicia visible` through sight openings, these indicia indi` eating the dimensionsotan obgect'being measureddirectly andwithout the trovlvible-V ment with'l eachother and by engagemer'it by oneof them with a crown gearcarried by andlrotatable with the rotary handle".

v'Another object ijs-the provision of a device ofthis character which is simple andrineX- pensivein manufacture-which will be eficient and accurate iniuse, a great time and labor saver, and a general improvement 1n theart.` 1;.

:With the Y above 1 and other objects and advantages in Y viewthe invention consists in the details of construction to Vbewherein-` after more fully described4 and vclaimed and illustrated in thevaccompanying drawings in whichy y Figure 1 is a side elevation of the device,

Fig. 2 is va longitudinal sectional view through thepessentialportion thereof, Fig. isa cross sectional View ontheline 3--3oiFig.2,

,'Fig. 4 is a cross vsectional yview onthe line 1 -4 of Fig. 2, and l F ig. '5 isa detail `iew showingintermeshing indicator wheels.` 'M

Referring morev particularly to the drawingythe numeral 10 designates the frame of the instrumentwhich is of the'usual semicircular shape and which has one `of its arms provided with an adjustably'mounted memberll with vwhich coperates another member kfor p e v anjfvobject placed between the 1 members.

Secured to"or vformed integrallyV upon the' with'the teeth 23.

determining c the dimensions of other arm of the frame 10 is a tubulariex-y Q tension v12 which has the outer portion. of. its bore threaded, as shown at 13. At one.

side, the tubular member l2'is provided with `a series of graduations 11i ranging from zero Slidably and rotasv tably mounted through the bore of the tubu- `flarmember 12 is a stem 15, theV end of which lto any 'suitable number.

`coperates with the stationary member 11. fThroughout a portion of its length the stem '15 is threaded, as shown at 1G, and this ,threaded portion is engaged Within.v the threaded portion 13 of the bore of the tubutlar member 12.

means of a'suitable key 17, is a sleeve 18 which hasv oneside partiallyv cut away, "as t Patenteaaug; 17, 1920."

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Spllned upon. the tubular member 12 by q s` are journaledindicator wheels 21. and 22, 'f

each of which carries indicia ranging from zero to 9. e kperiphery formed with ten teeth 23 and the wheel 22' has its periphery provided with The indicator' Wheel 21 has its a single tooth 2e engageable successivelyk wheel 22 is formed as a gear 25. It will be seen that the sleeve 18 is lnon-rotatable with respect to the tubular member 12 but may slide longitudinally thereon. i 'One end of the sleeve 18 is'reduced, as

Shown at 26, and engaged about this reduced portion is a guide sleeve 27 having an in'-` wardly extending flange 28. A shell 29 is secured upon the outside of the Sleeve y18 and is so shaped as tohave one end 30 engaging uponthe tubular member 12 and serving as a guide coperating withthe indicia 14 and adapted tov uncover the successive indicia as the sleeve 18 is moved upon thetubular member 12.

possible wabbling. This shell is alsoprorespectively, maybe `seen.`

is acylindrical handle member 33 of the same diameter as thev shell 29 and having its open end abuttingly engaging the open edgeof the shell and bearing upon the guide sleeve 27. Disposed within this handlevmember 33- is a cylindrical sleeve 34 constrained toA ro-r tategwith the handle ,member 33 byI virtue,

of the set screw 35 threaded through the On its underside thev This Shen has as i other end engaging upon the guide member 27 so that the` shell will be held against any 10o vided with sight openings 3,1 and 32 through 'Y which the indicia on the wheels 21 and-22,-

handle member and engaging the sleeve 34. Formed on this sleeve is an outwardly eX- tending flange 36 which engages against the inturned flange 28 on the sleeve 27 for hold-v ing the handle member 33 against .longitudinal movement with respect to the shell 29 and sleeve 1 8. Formed on the end of the sleeve 34 is a geai' 37 which meshes with the gear on the wheel 22.`

In the operation ofthe device it ywill be seen that when the handle 33 is rotated "in a counter-clockwise direction the stem 415 will be lrotated and owing to the threaded enh4 gagement of the latter within the outer end of the tubular member 12, the stem 15 willbe moved away from the stationary member 11; When it is desired to measure an object, `the handle 33 is rotated sufiiciently that the end of the-stem 15 will be disposed in spaced re-v lation to the stationary member 11, after which the object to be `measured is'placed against themember 11 and the handle 33 is' rotated in a clockwise'direction until the- I Astem 15 engages against the object. i' As this handle 33 'is rotated it'oil course 'progresses along the tubular member 12in accordance with the movement or' the stem 15 and cary ries with itthe sleeve 18 and shell 29, though sov these latter parts do not turn but move'longitudina'lly. As the sleeve 34 car- Y ried bythe handle member is'rotated, en-

gagement of the gear 37 with the gear 25 will cause rotation of the indicator wheel 22 and When the indicator wheel 22 moves one complete revolution it moves the indicator wheel 21 one stop or tooth. When the end of the stem 15 is engaged againstl the object beingV measured and the handle member 33 has been rotated until this engagement is formed, the

operator inspects the indicia 14 aiidnotes` the `highest one uncovered bythe shell V29 which will give the rough measurement. He then looks through the sight opening 31 and notes' the numeral visible therethrough which will give the main Vfraction .and then also notes which numeral is visible through the sightv opening -32 which gives the'smaller fraction. In actual practice the indicia 14 would indicate say, for exampletenths of an inch, those on the wheel 21 would indicate hundredths, and those on the wheel 22 would indicate thousandths. Any finer degree of measurement required might be determined by estimating vin case a numeral on the wheel 22 did not happen to be squarely beneath the opening 32." y Y From the foregoing description and a 'study of the drawings -it will be apparentv that I havethus provided an extremely sim-l ply constructed and readily operated micrometer gage by means of which very accurate readings may be Vobtained directly without any need for the use of a vernier scale. It will be `'observed that owing to the simplicityof structure there is little likelimerely hood of derangement and-the device shouldy therefore'be durable and el'hcient in service.

While I have shown and described the preerred embodiment of my invention it is of course tobe understood that I reserve the right to make such changesin the form, construction, vand arrangement of partsas will not depart from the spirit of the invention orthe scope of the subjoined claims.

Having thus described my invention I claim l.; A micrometer gage comprising a frameY including spaced arms, an abutment member 'carried by one of said arms, a tubular extension on the other arm having the outer end of itsV bore threaded, ,astem slidable' andV rotatable through said extension and having a Vportion threaded for engagement'v within thethreaded portion'ofsaid ,inenia ber, a sleeve splined upon saidv tubular e`X.

tension `and having a reduced portionfand also having :a portion cut away to provide a flat bearing surface, a guide sleeveengaged upon saidl reduced portion andhavingan inwardly extendingl annular VVflange, studs" mounted on said iat bearing surface, a pair of indicator wheels'journaled on such studs and each l,bearing indicia ranging from zero to' 9,.the periphery of'one-oil said wheels being provided with teeth andthe peripheryy of Vthe other Wheelbeing provided with a single tooth engaging. said rst named teeth successively, a gear formed on the underside of said second namedv wheel, ashell surrounding and secured tosaidsleeve'and forming `a housing `for said wheels, said shellfbeing Yprovided. with.' sight denings i le, the

outwardly extending flange engagingijsaid inwardly extending iange,V and a r'gear ivormedjon said last named sleevegand engaging said first named' gear. v l

being 2; A micrometer gage comprisinga frame including spaced arms, a tubular extension formed on `one end of said'arin's and yhaving the outer end of its borewthreaded, sleeve splined upon said extension, a, pair ofindi? cater wheels rotatably mounted on"`t he sleeve and carrying indicia,o ne wheelfhav'- ing its periphery 'provided with! ten teeth and the other having its peripheryprovided with a single tooth', gear teeth ormedo'n said second named wheel, ajshell securedi to i VsaidY sleeveland inclosing said wheels, said extensien behgiioid with jgradiiatieiis izo at one end of said shell being movable thereover, a stem slidable and rotatable through said extension and threaded for engagement Within the threaded portion of the bore thereof, a handle member secured upon Athe outer end of said stem, means'for preventing longitudinal movement of said handle member with respect to said sleeve a sleeve Within said handle member an movable therewith, and a gear formed on said last named sleeve meshing with the gear teeth on said second named indicator Wheel. v

3. A micrometer gage comprising a frame including spaced arms, a tubular extension on one arm of said frame and having a portion of its bore threaded, a stem slidable is and rotatable Within said extension and hav# bore thereof, a member slidable and non-rotatable yon said extensiornj a pair of intermeshing indicator Wheels on said member, a shell secured to said member and inclosing said Wheels andl provided Vwith sight openings, said eXtension being provided with graduations uncovered by longitudinal movement of said member outwardly, a handle member secured to the outer end of said stem, means for 'preventing longitudinall movement of said handle With respectito said first named member, Va sleeve Within and rotatable With said handle, and gear teethcarried by said sleeve and Vengaging one of said indicator Wheels.

yTHOMAS SHAW., 

